Created
June 16, 2014 17:08
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| public boolean isPerm(String str1, String str2) { | |
| // edge cases: null, len not equal, len = 0 | |
| if(str1 == null || str2 == null) | |
| return false; | |
| int m = str1.length(); | |
| int n = str2.length(); | |
| if(m != n) | |
| return false; | |
| if(m == 0) | |
| return true; | |
| // count character occurrences | |
| int[] count = new int[256]; | |
| for(int i = 0; i < m; i++) | |
| count[str1.charAt(i)]++; | |
| for(int i = 0; i < n; i++) | |
| { | |
| char c = str2.charAt(i); | |
| count[c]--; | |
| if(count[c] < 0) | |
| return false; | |
| } | |
| return true; | |
| } |
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line 9-10:
so "" is not a permutation of "" ?